Expansible boring tool



I. LITTLE.

EXPANSIBLE BORING TOOL.

APPLICATION FILED DEc.3I, I92o 'Jaim @me J. LITTLE.

EXPANSIBLE BORING TOOL. APPlLlcAlon man nEc.31.192o.

Patented May9, 1922...

' am mi@ cost.

JOHN LITTLEoFsT, Louis, MIssoUR.I,fAssieNoR To iol-IN :rl-Lamine oFs'lyl. Louis, i

y MISSOURI. 1 i ..1 I

EXPANSIBLE BORING troon Applicatipn ied'necemb'er31,1920. .seria No. 434,19s'gj- I To all 107mm t may cncem:

Be it known that I, JOHN LITTLE, a citizen of the United States, residing at St.

Louis, Missouri.- have -invented a' certain newv and useful Improvement in Expan'sible Boring Tools, ofl which the following-`isa full, clear, and exact description, such as will enable-othersskilled lin the art to'which it appertains tomake and use the same, reference being had to the accompanying drawings, forming part of this specification.`

This invention relates generally to boring tools for lathes and more' particularly to an expan'sible boring tool which is adapted to be expanded duringV theboring operations. .The objects of the invention are, to'provid'e an expansible boring tool for lathes which is simple inoperation, is of durable ,construction,- and Other objects ofthe invention are toprovide anexpansible boring tool which can be easily and quickly adjusted to different cut:-y tingy positions', and tol providel adjustable means whereby said tool will .remain yin its adjusted position without the aid ofany looking or retaining means. A f Further objects of the invention are to provide a radially expansible boring tool adapted to be used in combination with fixed boring tools" whereby two or morecutting operations can be performed by `means', of the same'lathe bar or tool holder.

Vith the foregoing andotherobjeets in view, my invention consists incertain novel features of construction and arrangement of parts, hereinafter more fully described and claimed, and illustrated in the vaccompanying drawings, in which'fy Figure 1I is a plan view of the device showing, in dotted lines, the Vexpansible boring tool and the `parts associatedtherewith in expanded-position.

' Figure 2 is a" front elevation. f

Figure 3 isa vertical cross yse'ction'taken on the line 3 3y of Figure 1f.` i l Figure 4' isla similar cross sectionl showing'certain parts in moved position;lv

Figure 5 is a. longitudinal cross section taken. onthe line 5 5 ofv Figurel 3. f

.' Figure -6 is a longitudinal"cross section through a drive shoe for cas-ings foroil wells before the boring operations.l y

Figure v'I' is. a similar view afterv certain When screw 22 is screwed to its'ho'me pojboring operations `haverfbeen' performed, and ready for theaexpansible'boring tool. :Figure 8 is a similarviejw of the finished article.; i j l Figure 9 is a detail viewv on they line99' of Figure 1.' Y l Referring by numerals tol the accompanyrangedtoibe carried by theturret of' a tur` ret lathe or.4 by the tail'stock ofiy a lathe.

Specification of Letters Patenti g l Pateivltd Mary 95- 1922,; I

ing drawings', l() designates alathe `barvorq` ,tool carrier, one end of wh1ch,'1f0,`"is ar+ A .transverse slot .11de-formed insaid'- bar in` the opposite end 10b, and, fixed in 'said slot, is a boring tool the ends ofwhich.

keiztend radially from said bai" the desired distanceand are provided with cutting faces -13."`The slot 11 is wider'fthanthe tool 12,`

and` one of side walls inclines ,upwardly r" asjat 112.51. n y, i. c

A wedge 14 having-'a corresponding" in'- `clined wally is, inserted fin 'slot 11,V Bearing.

- againstthe .underside ofthey ,wedge are the upper ends 'of screws which are threaded i 1n` the lower portion ofvbar lOI ,Bytu'rning screws 15 inthe proper direction, their vends are forced vagainst' the' wedge 14 cans# -ing it' tOLirr'QVe upwardly',an`d byf'yirtue ofl theengagement yofthe inclined'walls of said l wedge withth'e yinclined side-wall'll of vslot 11,.' said wedge vis'"forced"against A'the side ofy boring tool 112,."- thereby securely' clamping yit in'positio'n in'slot 11 of bar 1.0.YK The boringtool 12t is"locked position byscrew 16 threaded 'in vtheupper portion i i of bar j10 andv havingits lower end .tapered downwardly lso as to entera conicalv aperture` 1'? formed in boringtoolx121 To one n l.side of 'lathebar 10 is disposedja.blockvr 18 A.which is slida-bly supported jon `boring-tool 'i 12, by'nieans of a slot 18a formed in said'- block vandfwhiclrslot isoccupied'by one end" "off said boring toolv'12.l The vupper corner n Yof one side of saidbo'ring t`ool'12'is cutaway lto form a step or' groove 19 andv occupying 'said grooveis an*expansiblefcuttingtjtool V20. y

The outer end-0f the-cutting tool 20" is pro-v vided with acuttingface l21 and it'sinnerf '-sition, cutting tool 20 isengaged by lsaidscrew 'and securedto sli'dable bloclr'l'S.` f ',Tlie

`end isada'pted tofbe engaged by screw 22 f y, having threaded engagement*withslidablef' 'los rippen-portion of "-eX-pans'iblecut-tingpltooil", 20 n' projects above said boring tool 12 and enters a recess 23 formed in bloclr 18 whereby, when screw 22 is screwed home, expansible cutter 2O is` clamped between said screw and the shoulder 23 formed on block 13 and any bindingor sticking between said expansible cutting tool 2O and the boring tool 12 is avoided.

For the sake of convenience in manufacturing, the block 18 can be made in sections and secured together by anyv suitable means, such as screws 24. A flat bar 25 is longitudinally disposed on one side of lathe bar 10 and above slidable block 18. The outer end of the longitudinal bar 25 is connected by a link 26 to a horizontal handle 27 which is pivotally connected at 28 to the top of lathe bar 10. Longitudinal bar 25 is provided with an angularly disposed portion 25a which traverses a diagonal slot 29 formed in the upper face of slidable block 13. Longitudinal bar 25 is guided yin its longitudinal movement by guide blocks 31 fixed to the top of lathe bar 10 and having longitudinal slots in their vundersides which are traversed by the upper edge of bar 25.

Assuming the boring tool .is used in finishing drive shoes for casings for oil wells, one form of which is illustrated in Figures 6, 7, and 8, an unfinished or rough drive shoe 33 such as illustrated in Figure 6 is positioned in the chuck of a lathe and portions 311 and 35 of itsinterior are finished by a straight boring tool (not shown). The tapered portion 36 is now finished by boring tool 12 having tapered cutting faces 13. These finishing cuts will have round corners 37 and 38, Figure 7, and to remove these round corners and to cut an annular groove 39, (Figure 8) I employ the expansible cutter 20. After the tapered portion 36 has received its finishing cut, handle 27 is slowly moved toward the position shown in dotted lines in Figure 1. This movement of the handle feeds bar 25 forward and causes the angular portion 25a through its engagement with the ldiagonal slot 29 in block 18 to move vsaid block outwardly, thereby bringing the cutting face 21 of expansible boring tool 2() outwardly past the cutting face 13 of boring tool 12. This radial movement of the expansible cutter 20 permits the cutting operations to be performed within the interior of the drive shoe and the like in finishing annular shoulders or grooves without the necessity of employing a separate lathe bar. When the annular groove has been cut7 the eXpansible cutting tool 2O is withdrawn inwardly by means of handle 27 and the lathe bar 10 'can be removed from said drive shoe. The tapered portion 36 is now threaded, as shown in Figure 8, for a pipe and the annular groove 39 forms a seat against which the end of the pipe can be seated.

By means of my-expansible boring tool,

the various boring operations necessary in the manufacture of drive shoes and other material can be performed without removing and replacing the various cutting tools after each operation, thereby accomplishing disposed boring tool fixed to said bar an eX- pansible cutting tool mounted on said fixed boring tool, and manually controlled means for operating said expansible tool.

2. In a boring tool for lathes, a lathe bar,

a radially disposed boring tool fixed in said bar, a cutting tool movably mounted on said boring tool, and a longitudinally movable member having an angularly disposed por tion adapted to actuate said expansible tool. 3. In a boring tool for lathes, a lathe bar, a radially disposed boring tool fixed insaid bar, Aa radially movable block carried by said boring tool, a cutting tool Xed to said block, and manually actuated means adapted to move said bloclrradially with respect to the axis of said lathe bar.

4. In a boring tool for lathes, a lathe bar, a radially disposed boring. tool fixed to said bar, a slidable block carried by said boring to'ol7 a cutting tool fixed to said block, and f.

a longitudinally movable member supported on said lathe bar and provided with anangularly,` disposed portion in engagement with said block, whereby the longitudinal movement of said member will impart a rav dia` movement to said block and cutting too. i

.5. An expansible boring tool for lathes comprising a lathe bar7 a radially disposed boring tool fixed to said bar7 a cutting tool supported on said boring tool and adapted to be moved radially relative thereto, and a longitudinal 'movable member arranged to move said cutting tool.

6. An eXpansible boring tool for lathes i i comprising a lathe bar, a radially disposed boring tool'fiXed to said bar, a block slidably supported on said boring tool, a cutting tool carried by said block, and a longitudinally movable memberfhaving a cam portion in engagement with said block, which cam portion is adapted to move said block in radial direction when said longitudinal member is operated. i

7. An expansible boring tool for lathes comprising a lathe bar, a block slidably oarried thereon and movable in lateral direction, a cutting tool fixed to said block, and a longitudinal member movably supported on lar portion of said ,longitudinal member whereby said block andcutting tool are moved laterally when said longitudinaly member is actuated.

8. An expansible boring tool for lathes comprising a lathe bar, a block slidably carried thereon, la cutting tool removably fixed to said block, a longitudinally lmovable member having a cam portion cooperating With a groove in said block, which cam portion is adapted to impart radial movement to said blocli, and a handle pivotally mount-` ed in said bar for manually operating said longitudinal member.

9. In a boring tool for lathes,'a lathe bar provided With a transverse slot, a boring tool fixed in said slot and provided with outting faces extending radiallyfrom said bar,

an expansible cutting tool operating in a recess 'formed in said boring. tool, slidable means arranged to support said expansible cutting tool on said boring tool, and a longitudinally movable member having operative engagement with `said slidable means,

can be moved radially pasty the cutting face whereby the cutting face of said cutting tool a boring tool extending radially from said;

bar, a slidable block mounted 'on said boring tool, and a cutting tool fixed to said block adjacent to said boring tool, andmovable so that the cutting edge occupies a position beyond the boring edge of the boring tool.

In testimony whereof I hereunto aflix my signature this 28th day of December, 1920.

JOHN LITTLE. v 

